﻿using System;
using System.Configuration;
using System.Drawing;
using System.IO;

namespace ProjectShare
{
    public class CustomFun
    {
        public static string GetGuid()
        {
            return Guid.NewGuid().ToString().Replace("-", "");
        }
        public static string GetConfigAppSetting(string keyName)
        {
            string strValue = ConfigurationManager.AppSettings[keyName];
            return strValue;
        }
        //生产随机数
        public static string CreateRandomNum(int NumCount)
        {
            string allChar = "1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,J,K,P,Q,R,S,T,U,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,m,n,o,p,q,s,t,u,w,x,y,z";
            string[] allCharArray = allChar.Split(',');//拆分成数组
            string randomNum = "";
            int temp = -1;                             //记录上次随机数的数值，尽量避免产生几个相同的随机数
            Random rand = new Random();
            for (int i = 0; i < NumCount; i++)
            {
                if (temp != -1)
                {
                    rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
                }
                int t = rand.Next(35);
                if (temp == t)
                {
                    return CreateRandomNum(NumCount);
                }
                temp = t;
                randomNum += allCharArray[t];
            }
            return randomNum;
        }
        //生产图片
        public static MemoryStream CreateImage(string validateNum)
        {
            if (validateNum == null || validateNum.Trim() == string.Empty)
                return null;
            //生成BitMap图像
            Bitmap image = new Bitmap(90, 36);
            Graphics g = Graphics.FromImage(image);
            try
            {
                //画背景色
                g.Clear(Color.White);
                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
                //画验证码文字
                Font font = new Font("Arial", 18, (FontStyle.Bold | FontStyle.Italic));
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(validateNum, font, brush, 10, 4);
                MemoryStream ms = new MemoryStream();
                //将图像保存到指定流
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                return ms;
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
        public static bool IsCity(string AreaCode)
        {
            bool result = false;
            if (!string.IsNullOrEmpty(AreaCode))
            {
                string subString = AreaCode.Substring(4, 2);
                if (subString == "00")
                {
                    result = true;
                }
            }
            return result;
        }
    }
}
